I also have an Acer monitor, although it's a different model (X173w), and its internal EDID wasn't acceptable either. I finally twiddled the monitor's on-screed-display controls and got it to work, but had to add "modeline" entries to my xorg.conf file. I have no idea whether my entries for a 17-inch display would be correct for yours, or whether they might make matters worse, but here's my xorg.conf file. Note that my video card is from nvidia, not S3, so those parts would definitely NOT work for you.
Code:
# nvidia-xconfig: X configuration file generated by nvidia-xconfig
# nvidia-xconfig: version 1.0 (buildd@palmer) Tue Jan 22 12:05:14 UTC 2008
# xorg.conf (X.Org X Window System server configuration file)
#
# This file was generated by failsafeDexconf, using
# values from the debconf database and some overrides to use vesa mode.
#
# You should use dexconf or another such tool for creating a "real" xorg.conf
# For example:
# sudo dpkg-reconfigure -phigh xserver-xorg
Section "ServerLayout"
Identifier "Default Layout"
screen 0 "Default Screen" 0 0
Inputdevice "Configured Mouse" "CorePointer"
EndSection
Section "Files"
EndSection
Section "Module"
Load "glx"
Load "v4l"
EndSection
Section "InputDevice"
Identifier "Generic Keyboard"
Driver "kbd"
Option "XkbRules" "xorg"
Option "XkbModel" "pc105"
Option "XkbLayout" "us"
EndSection
Section "InputDevice"
Identifier "Configured Mouse"
Driver "mouse"
EndSection
Section "Monitor"
Identifier "Configured Monitor"
Vendorname "Acer"
Modelname "Acer X173Wv"
Horizsync 30.0 - 83.0
Vertrefresh 55.0 - 75.0
Gamma 1
modeline "800x600@56" 36.0 800 824 896 1024 600 601 603 625 +hsync +vsync
modeline "800x600@72" 50.0 800 856 976 1040 600 637 643 666 +hsync +vsync
modeline "800x600@75" 49.5 800 816 896 1056 600 601 604 625 +hsync +vsync
modeline "800x600@60" 40.0 800 840 968 1056 600 601 605 628 +hsync +vsync
modeline "1152x768@54" 65.0 1152 1178 1314 1472 768 771 777 806 +hsync +vsync
modeline "1280x854" 80.0 1280 1309 1460 1636 854 857 864 896 +hsync +vsync
modeline "1280x768@60" 80.1 1280 1344 1480 1680 768 769 772 795 -hsync +vsync
modeline "1280x720@60" 74.5 1280 1336 1472 1664 720 721 724 746 -hsync +vsync
modeline "1280x800@75" 107.2 1280 1360 1496 1712 800 801 804 835 -hsync +vsync
modeline "1280x768@75" 103.0 1280 1360 1496 1712 768 769 772 802 -hsync +vsync
modeline "1280x800@60" 83.5 1280 1344 1480 1680 800 801 804 828 -hsync +vsync
modeline "1440x900@75" 136.5 1440 1536 1688 1936 900 901 904 940 -hsync +vsync
modeline "1440x900@60" 106.5 1440 1520 1672 1904 900 901 904 932 -hsync +vsync
modeline "1600x1024@60" 136.4 1600 1704 1872 2144 1024 1025 1028 1060 -hsync +vsync
modeline "1680x1050@60" 147.1 1680 1784 1968 2256 1050 1051 1054 1087 -hsync +vsync
modeline "1680x1050@75" 188.1 1680 1800 1984 2288 1050 1051 1054 1096 -hsync +vsync
modeline "1920x1200@60" 193.2 1920 2048 2256 2592 1200 1201 1204 1242 -hsync +vsync
EndSection
Section "Device"
Identifier "Configured Video Device"
Driver "nvidia"
VendorName "NVIDIA Corporation"
Boardname "GeForce 6150SE nForce 430"
EndSection
Section "Screen"
Identifier "Default Screen"
Device "Configured Video Device"
Monitor "Configured Monitor"
Defaultdepth 24
SubSection "Display"
Virtual 1440 900
Depth 24
Modes "1440x900@75" "1440x900@60" "1280x800@60" "1280x768@75" "1280x800@75" "1280x720@60" "1280x768@60" "1280x854" "1152x768@54" "800x600@60" "800x600@75" "800x600@72" "800x600@56"
EndSubSection
EndSection
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